William I, Count of Luxembourg (1081–1131) was

count of Luxembourg The territory of Luxembourg has been ruled successively by counts, dukes and grand dukes. It was part of the medieval Kingdom of Germany, and later the Holy Roman Empire until it became a sovereign state in 1815. Counts of Luxembourg House of A ...

(1096–1131), in succession to his elder brother

Henry III of Luxembourg Henri III, Count of Luxembourg (died 1096) was count of Luxembourg from 1086 until his death. He succeeded his father, Conrad I. His mother was Clementia of Aquitaine. Henry III was the first count known to have established his permanent residenc ...

. They were both sons of Conrad and

Clementia of Aquitaine Clémence d'Aquitaine (1048, Poitiers, France – 4 January 1130) was the daughter of William VII, Duke of Aquitaine and Ermensinde de Longwy. Biography Around 1075 she married Conrad I, Count of Luxembourg and together they had: * Matilda; mar ...

. William was the first of his family to use the title ''count of Luxembourg'' in his documents. Like his predecessors, he was embroiled in debates with the

archbishop of Trier The Diocese of Trier, in English historically also known as ''Treves'' (IPA "tɾivz") from French ''Trèves'', is a Latin Church ecclesiastical territory or diocese of the Catholic church in Germany.Conrad II Conrad II ( – 4 June 1039), also known as and , was the emperor of the Holy Roman Empire from 1027 until his death in 1039. The first of a succession of four Salian emperors, who reigned for one century until 1125, Conrad ruled the kingdoms ...

(† 1136), count of Luxembourg * William, count of Gleiberg, documented in 1131 and in 1158 * Liutgarde (* 1120 - † 1170), married Henri II (* 1125 - † 1211), count of Grandpré

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* * 1081 births 1131 deaths Counts of Luxembourg House of Luxembourg {{Luxembourg-noble-stub